<!doctype html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport"
          content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <!-- 开发环境版本，包含了有帮助的命令行警告 -->
    <script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
</head>
<body>
<div id="app">
    <!-- {{}} 插值表达式-->
    {{message_1}}
    {{message_2}}
    <!-- 双向数据绑定 -->
    <input v-model="message_2">

</div>
</body>
<script>
    new Vue({
        el:'#app',
        data(){
            return{
                message_1:"Hello World" + new Date().toLocaleDateString(),
                message_2:"ABC",
            }
        }
    })
</script>
</html>